Nitrogen-doped carbon nanotube nickel-iron coated oxygen evolution catalytic material for water electrolysis and application

Abstract

The invention relates to preparation and application of a nitrogen-doped carbon nanotube nickel-iron coated oxygen evolution catalytic material for water electrolysis. A general formula of the composite electrode material is Ni0.9Fe0.1@CNx, wherein CN is nitrogen-doped carbon, and x is greater than or equal to 0.01 and less than or equal to 0.1. The specific preparation method of the catalytic material comprises the steps of uniformly mixing nickel acetate and ferric chloride with citric acid and thiourea according to certain molar percentages, and then carrying out calcinations for 1-10h under an N2 gas flow rate of 10-100 mL / min at 600-900 DEG C to prepare the catalytic material. The preparation method provided by the invention effectively achieves one-step preparation of the Ni0.9Fe0.1@CNx oxygen evolution catalytic material with set ratios of Ni, Fe, C and N by an in-situ solid-phase method, and the product is nanotube-shaped, porous and large in specific surface area, and has excellent performance when being used as an oxygen evolution electrode material for water electrolysis. The method provided by the invention is convenient to operate, the process is simple and easy to control, raw materials are low in price and easy to obtain, and the catalytic material is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production materials by electrolysis of water, and in particular relates to an oxygen evolution catalytic material for electrolysis of water and its application. Background technique [0002] With the rapid development of green secondary energy such as solar energy and wind energy, hydrogen production by hydrolysis using non-grid-connected green electric energy such as solar energy and wind energy has become a promising means of comprehensive utilization of green energy. However, the anode reaction of water electrolysis requires a complex 4H+ / 4e- process, and the electrocatalytic activity of anodic oxygen evolution materials plays a vital role in improving electrolysis efficiency, reducing energy consumption and cost of electrolysis of water. Practice has proved that the anode oxygen evolution catalytic material with practical value must have the characteristics of cheap and easy to obtain, high ...

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Problems solved by technology

At present, the methods for preparing transition metal / carbon nanocomposites mainly include: (1) arc discharge method. Jiang et al. prepared NiCo by arc discharge method. 0.16 Fe 0.34 -CNTs nanocomposite material, this method has strict requirements on the instrument, and H is used in the preparation process 2 , the operation is more dangerous; (2) chemical vapor deposition method, Ma Lei et al. used fluidized bed vapor deposition method on TiO 2 / Fe-Ni in situ deposition of CNTs to obtain CNTs / TiO 2 / Fe-Ni composite photocatalyst, this method has strict requirements on equipment, high production cost, and it is difficult to prepare N-doped transition metal / carbon composite materials; (3) impregnation-reduction method, Qiao et al. Ni-NG (N-doped graphene) composite nanomaterials were prepared in one step. The preparation process of this method is cumbersome. It needs to oxidize graphite to prepare graphite oxide, then reduce hydrazine to prepare NG, and then impregnate Ni 2+ , finally reduced to get Ni-NG, and the Ni in the Ni-NG prepared by this method cannot be uniformly dispersed on the NG; (4) High-temperature solid-phase decomposition method, which is simple and easy to operate, and has good safety performance. Metal / carbon nanocomposites adopt more methods

Liu et al. mixed 1,10-phenanthroline iron with ZIFs series metal-organic framework materials, and prepared Fe-NC nanocomposites by one-step high-temperature solid-state decomposition method, but the ligands of ZIFs series metal-organic framework materials are expensive. The synthesis process is complicated

[0004] However, the invention method of using cheap and easy-to-obtain nickel salt, iron salt, carbon source, and nitrogen source in situ solid-phase method to prepare nitrogen-doped carbon nanotube-coated nickel-iron electrolytic oxygen evolution catalytic material has not been reported yet.

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